Efficient removal of Cr(VI) from contaminated kaolin and anolyte by electrokinetic remediation with foamed iron anode electrode and acetic acid electrolyte.
Cr(VI) contaminated soil
Electrokinetic remediation
Electrolyte
Foamed iron
HAc
Journal
Environmental geochemistry and health
ISSN: 1573-2983
Titre abrégé: Environ Geochem Health
Pays: Netherlands
ID NLM: 8903118
Informations de publication
Date de publication:
21 Aug 2024
21 Aug 2024
Historique:
received:
06
06
2024
accepted:
29
07
2024
medline:
21
8
2024
pubmed:
21
8
2024
entrez:
21
8
2024
Statut:
epublish
Résumé
Combined electrokinetic remediation employing reducing agents represents an extensively utilized approach for the remediation of hexavalent chromium (Cr(VI))-contaminated soil. In this investigation, electrokinetic remediation of artificially contaminated kaolin was conducted utilizing a separate circulation system for the anolyte, with a 0.5M solution of acetic acid (HAc) as the electrolyte and foamed iron serving as the anode. The experimental outcomes demonstrated that employing HAc as the electrolyte enhances the electromigration of Cr(VI) and establishes an acidic milieu conducive to the reduction of Cr(VI) by foamed iron, thereby facilitating the rapid reduction of Cr(VI) accumulated in the anolyte through electrokinetic remediation. In the self-prepared contaminated kaolin, the initial concentration of Cr(VI) was 820.26 mg/L. Following the remediation process under optimal experimental conditions, the concentration was significantly reduced to 11.6 mg/L, achieving a removal efficiency of Cr(VI) in the soil of 98.59%. In the optimal experimental setup, the Cr(VI) concentration in the anolyte was reduced to 0.05 mg/L, which is below the EPA's Safe Drinking Water Act standard for Cr(VI) content of 0.1 mg/L. The removal mechanism of Cr(VI) from the electrolyte primarily involves reduction, precipitation, and co-precipitation, with the foamed iron playing a predominant role. HAc and foamed iron exhibit a synergistic effect. The findings of this study substantiate that the integration of foamed iron with HAc is efficacious for the electrokinetic remediation of soil contaminated with Cr(VI).
Identifiants
pubmed: 39167340
doi: 10.1007/s10653-024-02153-6
pii: 10.1007/s10653-024-02153-6
doi:
Substances chimiques
Chromium
0R0008Q3JB
chromium hexavalent ion
18540-29-9
Kaolin
24H4NWX5CO
Soil Pollutants
0
Acetic Acid
Q40Q9N063P
Iron
E1UOL152H7
Electrolytes
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
373Subventions
Organisme : the State Key Research and Development Program
ID : 2023YFC2907105
Organisme : Key Laboratory of Geochemical Exploration, Ministry of Natural Resources
ID : AS2019P02-02
Informations de copyright
© 2024. The Author(s), under exclusive licence to Springer Nature B.V.
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